Which RAID level has the lowest overhead of all RAID types?

RAID 0 is known for its low overhead because it does not implement any form of redundancy or data protection. Instead, it stripes data across multiple disks, which enhances performance and utilizes the full capacity of the storage devices. Since there is no duplication of data, all the available space on the disks is used for storage, leading to optimal efficiency in both storage capacity and speed.

In contrast, other RAID levels, such as RAID 1, RAID 5, and RAID 6, include redundancy strategies to protect against data loss. RAID 1 mirrors data across two drives, effectively halving usable storage capacity. RAID 5 and RAID 6 use parity data for fault tolerance, which also consumes storage space, though they provide a balance between redundancy and efficiency. However, these levels incur higher overhead due to the need for additional disks to store parity information and manage redundancy. Thus, RAID 0 stands out for its minimal overhead compared to other RAID configurations.